For 30 years, Jim Kouzes has asked leaders about their peak performances for "Leadership Challenge"—the book he and Barry Posner coauthored that has been called the best ever written on the subject. Fast Company talks to Kouzes about the essentials of leadership.

Whether you're being interviewed to be an intern or a CEO, you're going to run into a few notoriously tricky questions—here's a road map of what you'll be asked, and how to craft impressive answers to even the toughest questions.

Recruiting is among a company's most important challenges, but it's difficult to get a sense of someone based on a resume and a couple meetings. Here are three tips to help you hire employees who are the best fit.